First, let’s kill the anxiety. The FAA and TSA classify your CPAP machine as medical equipment, not carry-on luggage. That means it does not count toward your standard carry-on allowance. You can bring your CPAP bag plus your usual personal item and roller bag—yes, three bags total.
Just don’t check it. Never, ever check your CPAP. Imagine your beloved device tossed into the cargo hold, surviving baggage handlers and temperature swings. No thanks. Keep it with you in the cabin, where it’s safe and ready to use.